expand: expand

In RBigData/kazaam: Tools for Tall Distributed Matrices

Description

Expand a regular matrix owned on MPI rank 0 into a shaq.

Usage

expand(x, class = "shaq")

Arguments

x	A regular matrix.
class	'shaq' or 'tshaq'

Value

A shaq or a tshaq.

Communication

Short answer: quite a bit. Each local submatrix has to be received from rank 0.

Examples

spmd.code = "
  library(kazaam)
  if (comm.rank() == 0){
    x = matrix(runif(30), 10, 3)
  } else {
    x = NULL
  }
  
  dx = expand(x)
  dx
  
  finalize()
"

pbdMPI::execmpi(spmd.code=spmd.code, nranks=2)

RBigData/kazaam documentation built on Nov. 9, 2021, 9:09 a.m.